Here is the patch to fix it.
From: Li Yang <[EMAIL PROTECTED]> Date: Mon, 21 May 2007 13:08:57 +0800 Subject: [PATCH] ehci-fsl: fix cache coherency problem on system with large memory The patch fix bug http://bugzilla.kernel.org/show_bug.cgi?id=7482. It sets USB snooping on 4G space for PowerPC platforms without CONFIG_NOT_COHERENT_CACHE defined. Reported-by: Stefan Meyer <[EMAIL PROTECTED]> Signed-off-by: Li Yang <[EMAIL PROTECTED]> --- drivers/usb/host/ehci-fsl.c | 11 ++++++++++- drivers/usb/host/ehci-fsl.h | 1 + 2 files changed, 11 insertions(+), 1 deletions(-) diff --git a/drivers/usb/host/ehci-fsl.c b/drivers/usb/host/ehci-fsl.c index e802a13..369ea94 100644 --- a/drivers/usb/host/ehci-fsl.c +++ b/drivers/usb/host/ehci-fsl.c @@ -194,7 +194,16 @@ static void mpc83xx_usb_setup(struct usb_hcd *hcd) /* Enable PHY interface in the control reg. */ temp = in_be32(non_ehci + FSL_SOC_USB_CTRL); out_be32(non_ehci + FSL_SOC_USB_CTRL, temp | 0x00000004); - out_be32(non_ehci + FSL_SOC_USB_SNOOP1, 0x0000001b); +#if defined(CONFIG_PPC32) && !defined(CONFIG_NOT_COHERENT_CACHE) + /* Turn on cache snooping hardware, since some PowerPC platforms + * wholly rely on hardware to deal with cache coherent. */ + + /* Setup Snooping for all the 4GB space */ + /* SNOOP1 starts from 0x0, size 2G */ + out_be32(non_ehci + FSL_SOC_USB_SNOOP1, 0x0 | SNOOP_SIZE_2GB); + /* SNOOP2 starts from 0x80000000, size 2G */ + out_be32(non_ehci + FSL_SOC_USB_SNOOP2, 0x80000000 | SNOOP_SIZE_2GB); +#endif if ((pdata->operating_mode == FSL_USB2_DR_HOST) || (pdata->operating_mode == FSL_USB2_DR_OTG)) diff --git a/drivers/usb/host/ehci-fsl.h b/drivers/usb/host/ehci-fsl.h index f28736a..b5e59db 100644 --- a/drivers/usb/host/ehci-fsl.h +++ b/drivers/usb/host/ehci-fsl.h @@ -34,4 +34,5 @@ #define FSL_SOC_USB_PRICTRL 0x40c /* NOTE: big-endian */ #define FSL_SOC_USB_SICTRL 0x410 /* NOTE: big-endian */ #define FSL_SOC_USB_CTRL 0x500 /* NOTE: big-endian */ +#define SNOOP_SIZE_2GB 0x1e #endif /* _EHCI_FSL_H */ ------------------------------------------------------------------------- This SF.net email is sponsored by DB2 Express Download DB2 Express C - the FREE version of DB2 express and take control of your XML. No limits. Just data. Click to get it now. http://sourceforge.net/powerbar/db2/ _______________________________________________ linux-usb-devel@lists.sourceforge.net To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel
